Mutant X features Havok, a mutant and former member of the X-Men, who was transported into a parallel dimension. The "Mutant X" universe is a reimagination of the Earth-616 universe. In this continuum, Scott Summers was captured along with his parents by the Shi'ar and only Alex escaped, allowing him to be the eventual leader of the X-Men. The Mutant X universe reimagines Mister Fantastic, Nick Fury, and Professor X as villains and Doctor Doom and Apocalypse as heroes.